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/*
* GStreamer
* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Alternatively, the contents of this file may be used under the
* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
* which case the following provisions apply instead of the ones
* mentioned above:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-cvequalizehist
*
* Equalizes the histogram of a grayscale image with the cvEqualizeHist OpenCV
* function.
*
* ## Example launch line
*
* |[
* gst-launch-1.0 videotestsrc pattern=23 ! cvequalizehist ! videoconvert ! autovideosink
* ]|
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "gstcvequalizehist.h"
#include <opencv2/imgproc.hpp>
GST_DEBUG_CATEGORY_STATIC (gst_cv_equalize_hist_debug);
#define GST_CAT_DEFAULT gst_cv_equalize_hist_debug
static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("GRAY8")));
static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("GRAY8")));
G_DEFINE_TYPE_WITH_CODE (GstCvEqualizeHist, gst_cv_equalize_hist,
GST_TYPE_OPENCV_VIDEO_FILTER,
GST_DEBUG_CATEGORY_INIT (gst_cv_equalize_hist_debug, "cvequalizehist", 0,
"cvequalizehist");
);
GST_ELEMENT_REGISTER_DEFINE (cvequalizehist, "cvequalizehist", GST_RANK_NONE,
GST_TYPE_CV_EQUALIZE_HIST);
static GstFlowReturn gst_cv_equalize_hist_transform (GstOpencvVideoFilter *
filter, GstBuffer * buf, cv::Mat img, GstBuffer * outbuf, cv::Mat outimg);
static void
gst_cv_equalize_hist_class_init (GstCvEqualizeHistClass * klass)
{
GstOpencvVideoFilterClass *gstopencvbasefilter_class;
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
gstopencvbasefilter_class = (GstOpencvVideoFilterClass *) klass;
gstopencvbasefilter_class->cv_trans_func = gst_cv_equalize_hist_transform;
gst_element_class_add_static_pad_template (element_class, &src_factory);
gst_element_class_add_static_pad_template (element_class, &sink_factory);
gst_element_class_set_static_metadata (element_class,
"cvequalizehist",
"Transform/Effect/Video",
"Applies cvEqualizeHist OpenCV function to the image",
"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
}
static void
gst_cv_equalize_hist_init (GstCvEqualizeHist * filter)
{
gst_opencv_video_filter_set_in_place (GST_OPENCV_VIDEO_FILTER_CAST (filter),
FALSE);
}
static GstFlowReturn
gst_cv_equalize_hist_transform (GstOpencvVideoFilter * base,
GstBuffer * buf, cv::Mat img, GstBuffer * outbuf, cv::Mat outimg)
{
cv::equalizeHist (img, outimg);
return GST_FLOW_OK;
}
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